Composite heavy metal drill collar

Details Composite heavy metal drill collar Composite heavy metal drill collar

E - Fixed Constructions

21

B

255/26

E21B 17/16 (2006.01)

Patent

CA 1142167

Docket No. P-5479 APPLICATION FOR LETTERS PATENT OF NORMAN B. MOORE FOR COMPOSITE HEAVY METAL DRILL COLLAR ABSTRACT OF THE DISCLOSURE A composite drill collar for drilling bore holes in earth formations including a structural steel outer jacket having a lower end secured to a lower coupling connectable to a drill bit and an upper end secured to an upper coupling connec- table to an adjacent drill collar thereabove. An annular heavy metal core of depleted uranium or sintered tungsten is disposed in the jacket and is held in compression therein as by shrink fitting it to the jacket. The structural steel jacket has a heavy wall thickness to carry the bending, torsion, compression, tension and impact loads encountered in the drilling operation, so that such loads are not carried through the core, which has the purpose of increasing the density and mass of the composite drill collar, lessening considerably the tendency for a deviated well bore to be produced.

368054

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